DSPIC30F3012AT20ESLASHML datasheet(108/205 Pages) MICROCHIP

108 / 205 page

dsPIC30F2011/2012/3012/3013

DS70139E-page 106

15.9

Auto-Baud Support

To allow the system to determine baud rates of

received characters, the input can be optionally linked

to a selected capture input (IC1 for UART1 and IC2 for

UART2). To enable this mode, you must program the

input capture module to detect the falling and rising

edges of the Start bit.

15.10 UART Operation During CPU

Sleep and Idle Modes

15.10.1

UART OPERATION DURING CPU

SLEEP MODE

When the device enters Sleep mode, all clock sources

to the module are shut down and stay at logic ‘0’. If

entry into Sleep mode occurs while a transmission is in

progress, then the transmission is aborted. The UxTX

pin is driven to logic ‘1’. Similarly, if entry into Sleep

mode occurs while a reception is in progress, then the

reception is aborted. The UxSTA, UxMODE, transmit

and receive registers and buffers, and the UxBRG

If the WAKE bit (UxMODE<7>) is set before the device

enters Sleep mode, then a falling edge on the UxRX pin

will generate a receive interrupt. The Receive Interrupt

Select mode bit (URXISEL) has no effect for this func-

tion. If the receive interrupt is enabled, then this will

wake-up the device from Sleep. The UARTEN bit must

be set in order to generate a wake-up interrupt.

15.10.2

UART OPERATION DURING CPU

IDLE MODE

For the UART, the USIDL bit selects if the module will

stop operation when the device enters Idle mode or

whether the module will continue on Idle. If USIDL = 0,

the module will continue operation during Idle mode. If

USIDL = 1, the module will stop on Idle.

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